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UENR5457-03 December 2016

Component Locations Part Number 164-6981

Machine Location 1

Schematic Location B-5

Cyilinder Gp - Boom

Note A

2

F-8

Cyilinder Gp - Bucket

Note A

3

F-8

Description Accumulator Gp

Cyilinder Gp - Stick Filter Gp - Oil

Note A

4

F-7

188-4140

5

A-5

Filter Gp - Oil (Case Drain)

289-8194

6

A-4

Filter Gp - Oil (Pilot)

158-8987

7

A-4

Motor Gp - Swing

334-9970

8

F-6

Motor Gp - Travel (LH)

209-5992

9

F-5

Motor Gp - Travel (RH)

209-5992

10

F-3

Pump Gp - Pistion (Main)

422-1294

11

B-2

Sensor As - Pressure (Drive Pilot)

338-6970

12

C-1

Sensor As - Pressure (Drive)

434-3436

13

A-3

Sensor As - Pressure (Idler Pilot)

338-6970

14

C-6

Sensor As - Pressure (Idler)

434-3436

15

B-3

Swivel Gp

234-4440

16

E-4

Valve Gp - Check (Oil Cooler Bypass)

173-4672

17

A-8

Valve Gp - Load Control (Boom)

255-5683

18

E-2

Valve Gp - Load Control (Stick)

255-5680

19

E-5

Valve Gp - Main Control

259-7380

20

D-1

Valve Gp - Pilot Control (Left Joystick)

297-0533

21

C-8

Valve Gp - Pilot Control (Right Joystick)

297-0532

22

C-7

Valve Gp - Pilot Manifold

215-5037

23

B-7

Valve Gp - Pilot Travel

369-8502

24

E-8

Valve Gp - Pressure Reducing (Boom, Swing Priority)

310-0210

25

B-4

Valve Gp - Shuttle

164-6979

26

C-4

Valve Gp - Shuttle (Cab)

185-0462

27

B-8

Valve Gp - Swing Cushion

322-8716

28

E-6

Valve Gp - Travel Couterbalance (LH)

322-8714

29

E-5

Valve Gp - Travel Couterbalance (RH)

322-8714

30

E-4

Valve Gp - Solenoid (Heavy Lift - Option)

352-7176

31

B-5

BASIC COMPONENT SYMBOLS MAIN

14

24

FLUID CONDITIONER

SPRING

CONTROL VALVES

VARIABILITY

SPRING (ADJUSTABLE)

LINE RESTRICTION (VARIABLE)

PRESSURE COMPENSATION

RESTRICTION

LINE RESTRICTION (FIXED)

AUX

PUMP (2 - SECTION)

ONE POSITION

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

TWO POSITION

ATTACHMENT

VALVE PORTS

THREE POSITION

TWO - WAY

THREE - WAY

CONTROL VALVES AB

PUMP (VARIABLE & PRESSURE COMPENSATED)

LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)

VALVES

VALVE ENVELOPES

FOUR - WAY

CHECK VALVES

A B

P T

P T

NORMAL POSITION

SHIFTED POSITION

BASIC SYMBOL

INFINITE POSITION

SPRING LOADED

SHUTTLE

PILOT CONTROLLED

FLUID STORAGE RESERVOIRS

20

17

18 19

PRESSURIZED

VENTED

326D2 Excavator Hydraulic System

Note A: Refer To Parts Manual For Your Specific Machine.

RETURN ABOVE FLUID LEVEL

RETURN BELOW FLUID LEVEL

MEASUREMENT

PRESSURE

ROTATING SHAFTS

TEMPERATURE

FLOW

UNIDIRECTIONAL

BIDIRECTIONAL

COMBINATION CONTROLS

KGY1-Up REC1-UP MGW1-UP NBX1-UP JFL1-UP XAM1-UP MZH1-UP LCW10001-UP HM41-UP

SOLENOID

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID & PILOT OR MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

PUSH - PULL LEVER

GENERAL MANUAL

MANUAL SHUTOFF

PUSH BUTTON

PEDAL

PILOT CONTROL SYMBOLS

RELEASED PRESSURE

SPRING

REMOTE SUPPLY PRESSURE

25

Tap Locations Pressure, Sampling, and Sensor

31 Schematic Location

Description

PUMP OR MOTOR

12

Note: Check Part Number In The Parts Manual For Your Specific Machine.

Tap Number

FLUID POWER SYMBOLS

AA

Pilot Pump Delivery Pressure

BB

Idler Pump Delivery Pressure

A-3

CC

Drive Pump Delivery Pressure

A-5

Drive Pump Power Shift Pressure

B-2

EE

Idler Pump Power Shift Pressure

A-2

FF

Case Drain Pressure

A-2

SOS

Oil Sampling Port

A-4

INTERNAL RETURN

SPRING LOADED

GAS CHARGED

LINES CROSSING

21

27

22

26

23

BB

6

SINGLE ACTING

LINES JOINING

INTERNAL PASSAGEWAYS

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLE ACTING

INFINITE POSITIONING

3 POSITION

FLOW IN ONE DIRECTION

PARALLEL FLOW

CROSS FLOW

2 POSITION

FLOW IN EITHER DIRECTION

CAT, CATERPILLAR, their respective logos, “Caterpillar Yellow”, and the POWER EDGE trade dress as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission.

©2016 Caterpillar All Rights Reserved

MAIN VALVE - VIEW FROM REAR

CAB - TOP VIEW DD

FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

INTERNAL SUPPLY PRESSURE

HYDRAULIC & PNEUMATIC CYLINDERS

1

NOT SHOWN

CC

COMPLETE

HYDRAULIC MOTORS

HYDRAULIC PUMPS FIXED DISPLACEMENT

SIMPLIFIED

CROSSING & JOINING LINES

ACCUMULATORS

BEHIND PILOT VALVE

B-3

DD

EXTERNAL RETURN

4

2

5

ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)

G

3

M

TRANSDUCER (FLUID)

TRANSDUCER (GAS / AIR)

GENERATOR

ELECTRIC MOTOR

PRESSURE SWITCH

PRESSURE SWITCH (ADJUSTABLE)

TEMPERATURE SWITCH

ELECTRICAL WIRE

HYDRAULIC SCHEMATIC EXAMPLE

CURRENT STANDARD

CURRENT STANDARD

28

HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG” WIRE

8

EE

CIRCUIT NUMBER IDENTIFICATION

325-AG135 PK-14

CIRCUIT NUMBER IDENTIFICATION

WIRE COLOR

WIRE COLOR

WIRE GAUGE

325-PK

PREVIOUS STANDARD WIRE

WIRE COLOR

B

325-PK-14

CIRCUIT NUMBER IDENTIFICATION

AA 7

SOS

9 29 30 10 13

11

15

FF

PUMP - RIGHT SIDE VIEW

MACHINE - RIGHT REAR VIEW

WIRE GAUGE

A

(EXAMPLE VALVE)

(Dimensions: 39 inches x 28 inches)

ELECTRICAL SCHEMATIC EXAMPLE

30 Page,

WIRE NUMBER IDENTIFICATION CODES

UENR5457-03

16

8

7

1

(4) STICK CYLINDER

(3) BUCKET CYLINDER

F Pp3

AG

2

(10) MOTOR GP TRAVEL (RH) 209-5992

MU B1

DR

3

(8) MOTOR GP SWING 334-9970 482-6393

DR

MU

4

(9) MOTOR GP TRAVEL (LH) 209-5992

PG

SWG MOTOR DRAIN

A1

5

SWING MOTOR

SWG PRKG BK CONTROL

F

6

Pp3

BG T1 A1

DR

T2

B1

AR3

T1

BR3

AL3

BL3

T2

(2) BOOM CYLINDERS MA

(28) VALVE GP SWING CUSHION 158-9085

(29) VALVE GP SWING CUSHION (FINE SWING) 322-8716 (24) VALVE GP PILOT (TRAVEL) 369-8502

B(L)

A(R)

A

B(L)

A(R)

BL2 BL2

AL2

TRAVEL(R)

AL1

BL1

(BKWD)

(FWD)

FWD

T2 bL1

bR1

SP2

T 5 4

NOTE A

4

2 1

3

6

PD-Pi

JRP

Di4

BR1

Pi4

BL1

aR1

(IN)

(BKWD)

(L)

A3

A5

B4

C

A6

B5

NOTE A

A7

(OUT)

UP JR1

(R)

AR2

BP1 BT R1 BR4

Pi1 (DOWN)

(CLOSE)

(FWD)

bL4

bL3

Pi2

Di2

(14) SENSOR AS - PRESSURE (NFC-IDLER PUMP) 338-6970

bL2

Pi3

(IN)

B6

B7

B8

MF-P

DST

PL

bR5 aL4

(31) VALVE GP SOLENOID (HEAVY LIFT) 352-7176

bL3

bL4

aL3

PRV-PI

P-IN

PSA2

MU R3 C

DR1

(23) VALVE GP PILOT MANIFOLD 215-5037

PRV-P2

PSA1

HL-Dr

IF HEAVY LIFT IS EQUIPPED

A1

B1

(25) VALVE GP PRESSURE REDUCING (BOOM,SWING PRIORITY) 310-0210

A2

B2

SDr

PRV-Dr

DR4

Pi2 SWG PRKG BK CONTROL

DR5

T-OUT1 MF-TANK

DR6

(5) FILTER GP OIL 188-4140

G2

Pn2 Ps2

A2

P2

CALLOUTS

DD

PsM2

S3

PRV-P2

(Machine Location from Component LocationsTable)

FF

DrM PsM1

IN

EE

Ps1

A1 OUT

PR

HR

Pn1

AA 4

Ps

Pi PG

PC

SOS

D

Connectors (By letter) (52) VALVE GP - CONTROL 138-1234 Part Number

Component Name

Dr

DRAIN FILTER

MF-P

Ps

DL

Callout Number

Pm

Taps (Pressure, Sampling, Sensor - by letter)

YY DL

(7) FILTER GP OIL (PILOT) 158-8987

5

Air Line

HL

Component Group

PRV-Dr

T

(6) FILTER GP OIL (CASE DRAIN) 289-8194

B

Drain / Return Lines

T

6

Pressure Line Pilot / Load Sensing Pressure

Di2

A

LINE PATTERNS

M2

PL

Di1

MF-TANK

7

(11) PUMP GP PISTON (MAIN) 272-6957 422-1294

BB

309-5769 PRESSURE SWITCH OR 454-5075 PRESSURE SENSOR

DST

PRV-P1

BDr

C/V T

Pi3

S1

DR3

NOTE A:

(1) ACCUMULATOR GP 164-6981

PAC

F

HR

bR5

(15) SENSOR AS -PRESSURE (IDLER PUMP) 434-3436

bL2-2

IF HEAVY LIFT IS EQUIPPED

P1

A E

aR5

P1

G D

FR

RR

P

HL-Dr

Di3

NO.2 (SWING)

NO.1 (TRAVEL)

aR4

C

(12) SENSOR AS - PRESSURE (NFC-DRIVE PUMP) 338-6970

(26) VALVE GP SHUTTLE 164-6979

T

T-OUT2 DR2

(17) VALVE GP CHECK (OIL COOLER BYPASS) 173-4672

A

Pi5

PD-Pi

bR4

BPi

Di1

HL-Pi

PD-Dr

Pi1

bR4

U

Pi2 P2

bR3

PR

IF HEAVY LIFT IS EQUIPPED

HL-Pi

bR3

(OUT)

Di3

Di4

SPi

(UP)

bR1

aL4-2

Pi4

(OPEN)

bR2 Pi5 bL1

IF HEAVY LIFT IS EQUIPPED

2 SPEED TRAVEL CONTROL

BUCKET

(FWD)

bL2-2

A8

bL2

8

D

aR5

STICK(2)

DOWN JR3

aL2

B

R3

BOOM(1)

CLOSE JR2

(32) SENSOR AS PRESSURE (IMPLEMENT)

PiI

BR2

ATCH

OPEN JR4

SWING

L JL4

BOOM

STICK(1)

BUCKET

BOOM(2)

SWING

A4

B3

aR3

aR4

aR3

(BKWD)

aL2-2

B2

AR3

(22) VALVE GP PILOT CONTROL (RIGHT JOYSTICK) 297-0532

(27) VALVE GP SHUTTLE (CAB) 185-0462 464-7318 B1

BR3

AR1

(20) VALVE GP MAIN CONTROL 259-7380 285-1349 (HEAVY LIFT)

HL

B

BL2

NO.3 (LOCK)

(Dimensions: 39 inches x 28 inches)

30 Page,

UENR5457-03

R JL2

A2

BP2

JRT

STICK

A1

BL3

(UP)

AL1

aR2

ST R2

BP3

NOTE A

JLP

IN JL3

AR5

BR5

BR4

2

JLT

OUT JL1

SP1

(34) SENSOR AS PRESSURE (RIGHT TRAVEL)

PD-Dr

1 5

(21) VALVE GP PILOT CONTROL (LEFT JOYSTICK) 297-0533

3

6

BDr

Pi1

AL2 aL3

(33) SENSOR AS PRESSURE (LEFT TRAVEL)

AR4

aL1

aL2-2

D

C

aL2

AR5

C/V - T

aR1

AL4

TRAVEL(R)

aL1

(18) VALVE GP LOAD CONTROL (BOOM) 255-5683 2 SPEED TRAVEL CONTROL

DRAIN FILTER

AL4

T3

T6

(16) SWIVEL GP 234-4440

AL3

BKWD

T4

BR1 (FWD)

BPi

SP3

aL4-2

BR4

E

SPi

aL4

FWD

BL3

SDr

AR1 (BKWD)

SWG MOTOR DRAIN

(19) VALVE GP LOAD CONTROL (STICK) 255-5680 BR5

AR4

(30) VALVE GP-TRAVEL COUNTERBALANCE (RH) 322-8714

(29) VALVE GP-TRAVEL COUNTERBALANCE (LH) 322-8714

AL2

TRAVEL(L)

T5

A

B

TT

T1

MA

B

TP

BKWD

MB

TRAVEL(L)

E

MB

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS PILOT PUMP OUTPUT DRIVE PUMP OUTPUT LEFT TRAVEL CONTROL CIRCUIT POWER SHIFT CONTROL CIRCUIT SUPPLY LINE STICK CYLINDER CONTROL CIRCUIT ATTACHMENT CONTROL CIRCUIT SWING CONTROL CIRCUIT DRAIN / RETURN LINE SWING BRAKE CONTROL CIRCUIT IDLER PUMP OUTPUT TRAVEL SPEED CONTROL CIRCUIT BUCKET CYLINDER CONTROL CIRCUIT RIGHT TRAVEL CONTROL CIRCUIT BOOM CYLINDER CONTROL CIRCUIT HEAVY LIFT CONTROL CIRCUIT

M1 A3 G1

(13) SENSOR AS PRESSURE (DRIVE) 434-3436

326D2 Excavator Hydraulic System UENR5457-03 SCHEMATIC PART NUMBER: 255-5782 HE 01, 477-8801 HE 00

CC

Components are shown installed on a fully operable machine with the key and engine off. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations. Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.

3

2

1

A